WO2019192766A1 - Dispositif et procédé d'extraction d'un signal - Google Patents

Dispositif et procédé d'extraction d'un signal Download PDF

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Publication number
WO2019192766A1
WO2019192766A1 PCT/EP2019/053252 EP2019053252W WO2019192766A1 WO 2019192766 A1 WO2019192766 A1 WO 2019192766A1 EP 2019053252 W EP2019053252 W EP 2019053252W WO 2019192766 A1 WO2019192766 A1 WO 2019192766A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
output
predetermined
signal line
binary
Prior art date
Application number
PCT/EP2019/053252
Other languages
German (de)
English (en)
Inventor
Pio Torre Flores
Hans-Peter Meyen
Bernd Lichtenberg
Andreas Westendorf
Patrick Zerrer
Bernd GOHLICKE
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2019192766A1 publication Critical patent/WO2019192766A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/40006—Architecture of a communication node
    • H04L12/40032—Details regarding a bus interface enhancer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L2012/40208—Bus networks characterized by the use of a particular bus standard
    • H04L2012/40215—Controller Area Network CAN

Definitions

  • the present invention relates to an apparatus and a method for
  • the invention relates to the coupling out of a digital signal on a signal line.
  • a wired digital signal transmission takes place in numerous
  • serial bus systems are known in which serial digital data can be exchanged over two twisted insulated copper wires.
  • Bus system is a so-called CAN bus (Controller Area Network Bus).
  • CAN bus Controller Area Network Bus
  • multiple transmitting and receiving devices can be connected to a signal line.
  • the signal line can be terminated at its ends with a defined terminating resistor.
  • Document DE 10 2005 042 060 A1 discloses a tap device for a wireless tapping of CAN data from a CAN line. The tap is done via the electromagnetic field, which surrounds a CAN cable. Disclosure of the invention
  • the present invention provides a device for decoupling a signal having the features of patent claim 1, and a method for decoupling a signal having the features of patent claim 10.
  • the detection device is designed to detect a signal change on a signal line. Further, the detection means is adapted to generate a binary signal using the detected signal change
  • the analyzer is adapted to a predetermined characteristic in a time course of the of the
  • the output device is configured to invert the binary signal if the predetermined characteristic has been identified in the time history of the binary signal provided by the detector. Otherwise, i. if the predetermined characteristic has not been identified, the output device outputs the binary signal not inverted.
  • the method further comprises a step of identifying a predetermined characteristic in a time history of the provided binary signal.
  • the method includes a step of inverting the binary signal if the predetermined characteristic has been identified in the provided binary signal, and otherwise, that is, if the predetermined characteristic is in the binary signal provided binary signal has not been identified, outputting the non-inverted binary signal.
  • the present invention is based on the finding that in the
  • Transmission of digital signals can change the signal between two states. Depending on the type of decoupling of the signal, this can occur on a signal line for exchanging the two digital states.
  • the "swapping" of states is dependent on attaching a sensor to pick up the digital signals on the signal line.
  • the invention provides to analyze a sequence of decoupled signals and characteristic properties in the
  • Properties include, for example, a known relationship between the two binary states on the signal line. If, for example, a sequence of ones and zeros is transmitted via the signal line, then
  • a decoupled signal can also be analyzed for known regular transmitted sequences.
  • the analysis for the identification of predetermined properties in the decoupled signal and also, if appropriate, for the inversion of the binary signal can be effected for example by means of discrete components.
  • circuit structures by means of discrete active and / or passive components such as resistors, capacitors,
  • Operational amplifiers, logic gates, etc. are used.
  • a total or at least partial signal processing by means of a digital signal processor or the like is possible.
  • the present invention is explained in the context of binary signals, the invention is not limited to this, but the evaluation according to the invention can also be used for example for ternary signals with three different signal levels or possibly also for signals with several different signal levels.
  • the analysis device comprises an integrator.
  • the integrator may be configured to integrate the binary signal provided by the detector over a predetermined period of time. By integrating or averaging the provided binary signal over a predetermined period of time, for example, it can be determined which of the two binary states occurs longer or more frequently in the provided binary signal. For example, it can be deduced from this property which of the two binary states corresponds to the state which occurs more frequently in the original signal on the signal line or on average over a relatively long period of time.
  • the predetermined period of time corresponds to a time duration for the transmission of a predetermined number of data elements on the signal line. As a data element in this case, for example, the
  • Properties in the provided binary signal are preferably a plurality of such data elements, in particular a plurality of sequences of
  • Properties are increased.
  • two, three or moreover also, for example, ten or more such data elements can be evaluated together in order to identify predetermined characteristic properties therefrom.
  • consideration of time intervals corresponding to tens, fifteen, twenty or more data items may be used for the identification of predetermined characteristic features.
  • the detection device comprises a
  • the sensor device can be designed to output a voltage value corresponding to the signal change on the signal line. For example, the sensor device during a
  • the sensor device may comprise a capacitive sensor.
  • the detection device in particular the sensor device of the detection device, an electrically conductive sheath include, which completely or at least partially surrounds the signal line along a predetermined length.
  • the electrically conductive sheath with the electrical conductor in the interior of the signal line for example, form a cylindrical capacitor.
  • a corresponding areal capacitive decoupling can take place.
  • charging or discharging of this cylindrical capacitor takes place, whereby the respective charging or discharging currents can be evaluated. In this way, a feedback-free decoupling of the signals on the signal line is possible.
  • the detection device comprises a
  • the evaluation device can be designed to output a first signal value after the voltage value output by the sensor device has exceeded a first threshold value. Furthermore, the evaluation device can be designed to output a second signal value after the signal output by the sensor device
  • Voltage value has fallen below a second threshold.
  • the first threshold value may be greater than the second threshold value.
  • Such an evaluation device can be realized for example by means of a so-called Schmitt trigger. As a result, a reliable signal conditioning is possible. In particular, the two digital states on the signal line can be reliably distinguished.
  • the device comprises a
  • the transmission device may be configured to provide an output signal corresponding to the inverted or non-inverted signal output by the output device.
  • the transmission device can output an output signal, which in voltage level and possibly further electrical
  • Characteristics corresponds to a signal corresponding to the original signal on the signal line. In this way, a signal corresponding to the original signal on the signal line can be provided. According to one embodiment, identifying comprises the predetermined
  • identifying the predetermined characteristic comprises identifying
  • Figure 1 a schematic representation of a block diagram of a
  • FIG. 2 shows a schematic representation of a flowchart on which a method for decoupling a signal according to an embodiment is based.
  • Figure 1 shows a schematic representation of a block diagram as it is based on a device 1 for coupling out a signal according to one embodiment.
  • the device 1 for decoupling the signal comprises a detection device 10, an analysis device 20 and a
  • the device 1 for decoupling the Signal include a transmission device 40.
  • a digital signal can be transmitted on a signal line 2.
  • the signal line 2 may comprise, for example, one or more copper lines surrounded by an isolation medium.
  • the isolation medium for example, the
  • Signal line 2 twisted, insulated copper wires include. Such an embodiment is used for example for the transmission of digital signals on a so-called CAN bus.
  • the leads may end up with an impedance of e.g. 120 ohms to be completed.
  • two or more transceivers may be connected which feed the digital signals to the signal line 2 or receive digital signals.
  • a transmitter feeds digital signals into the signal line 2
  • a receiver receives these signals.
  • the present invention is not limited to a signal line 2 having exactly two copper lines.
  • one of the insulated copper lines with an electrically conductive material, such as a metal foil 11, are sheathed.
  • the respective line along a predetermined length with the
  • Metal foil 11 are sheathed. In this way, the inner conductor binds together with the casing 11 a cylindrical capacitor.
  • the respective insulated copper pipe can be sheathed over a length of one or several centimeters. This results in a capacity of a few picofarads (pF) for the cylinder capacitor designed in this way.
  • both copper lines can each be encased by an electrically conductive material 11.
  • the length can be adjusted according to a thickness of the dielectric insulation of the conductor.
  • Signal line 2 while the so-formed cylinder capacitors are charged or discharged can be from a
  • the signal conditioning unit 12 may include a transimpedance amplifier that converts an input current into an output voltage.
  • the tap of the signals on the signal line 2 can be done without power.
  • a terminal of the cylindrical capacitor can be connected to a reference potential (signal ground), and the respective other terminal of the cylindrical capacitor can also be connected to this reference potential via an operational amplifier.
  • the voltage drop across the capacitor is zero, so that also the power to the capacitor is zero. Accordingly, no power is taken from the signal line 2.
  • the signal on the signal line 2 without power, that is, without affecting the signal line 2 done.
  • the evaluation device 13 can output a first signal value, for example a first electrical voltage, after the previously generated one
  • Voltage pulse from the signal conditioning unit 12 has exceeded a first, upper threshold. Furthermore, a second signal value, in particular a low voltage value, can be output, after which the voltage pulse from the signal conditioning unit 12 has fallen below a second, lower voltage value. In this way, a digital signal sequence can be generated, which corresponds to the digital signal on the signal line 2.
  • the threshold values can be fixed. Alternatively, it is also possible to adjust the threshold values dynamically. For example, two corresponding conductors can be analyzed together and the Output values that correspond to the two values will be compared with each other. Accordingly, in this case, for example, the
  • the thus generated digital signal is at the output of
  • Evaluation device 13 either with the correct polarity available or the signal is complementary to the original digital signal on the
  • a further evaluation takes place in the analysis device 20.
  • suitable characteristic properties of the digital signal can be identified.
  • the signal output by the evaluation device 13 can be supplied to an integrator stage 21.
  • the time constant of such an integrator stage 21 should be chosen to be sufficiently large, for example, the multiple of the length of a message on the signal line 2. In particular, for example, over a length of ten or more message durations can be integrated.
  • the integration result can then be compared with a known ratio between the low and the high levels on the signal line 2. Accordingly, it can then be decided based on this comparison, whether the signal output by the evaluation device 13 is already correct or as
  • Signal line 2 transmitted messages each have a uniform distribution of high and low signal levels, then there is an average of 1/2 during integration.
  • an average of 1/2 for example, is known that between the Transmission of the individual messages of the signal levels on the signal line 2 has a high (or low) signal level, it follows from the knowledge that the average formed from the integration must be higher (or lower) than 1/2. Accordingly, it can be decided from this information whether the signal output by the evaluation device 13 has to be inverted or not.
  • the analysis device 20 can then provide a corresponding output signal to the output device 30 depending on the decision as to whether the signal output by the evaluation device 13 is to be inverted or not.
  • the output device 30 can then, depending on this signal provided, either output the signal directly from the evaluation device 13 or invert it prior to output. For example, for this purpose, the signal received by the output device 30 in two
  • the signal provided is inverted in an inverter 31 and the signal thus inverted is provided at a further input of the switching element 32.
  • the switching element 32 can then in dependence on that of the analysis device 20th
  • a digital signal is present at the output of the output device 30, which also corresponds with respect to the signal values to the digital signal on the signal line 2.
  • a digital signal is thus available which corresponds to the digital signal on the signal line 2.
  • the signal correspond to the voltage levels of the circuit technology used.
  • the signal can be output at TTL voltage level.
  • the signal of a transmission device 40 can be provided.
  • the transmission device 40 may, if necessary, adjust the voltage levels.
  • the impedance on the output side can be adapted, a corresponding driver stage for outputting a required electric power of the output signal can be provided, etc.
  • the transmission device 40 can also provide a digital signal which is CAN compliant.
  • the output signals can be adjusted by the transmission device 40 accordingly, so that by the
  • Transmission means 40 corresponding output signals corresponding to the signals on the signal line 2. But also the output of a signal with
  • Signal characteristics such as voltage, power, impedance, etc., which are different from the characteristics on the signal line 2, are possible.
  • FIG. 2 shows a schematic representation of a flow chart, as it is based on a method for coupling a digital signal on a signal line.
  • step S1 a signal change on the signal line 2 is detected.
  • step S2 a binary signal is then provided, the provision using the detected signal change on the
  • step S3 at least one predetermined characteristic in a time profile of the thus provided signal
  • step S4 the inverted signal is inverted and output if the predetermined characteristic has been identified in the provided binary signal.
  • step S5 the non-inverted binary signal is output if the predetermined one characteristic property in the provided signal has not been identified.
  • the present invention relates to picking up a digital signal on a signal line.
  • the digital signal can be tapped without power so that there is no influence on the original digital signal.
  • the tapped signal is then evaluated to identify a characteristic property in the signal. Depending on detection of this characteristic, the tapped signal is either inverted or not before output.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Dc Digital Transmission (AREA)

Abstract

La présente invention concerne le prélèvement d'un signal numérique sur une ligne d'acheminement des signaux. Le signal numérique peut notamment être prélevé de manière exempte de toute performance afin d'éviter toute influence du signal numérique initial. Le signal prélevé est ensuite évalué afin d'identifier une propriété caractéristique du signal. En fonction de la détection de cette propriété caractéristique, le signal prélevé est inversé ou non avant la sortie.
PCT/EP2019/053252 2018-04-06 2019-02-11 Dispositif et procédé d'extraction d'un signal WO2019192766A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018205202.6A DE102018205202A1 (de) 2018-04-06 2018-04-06 Vorrichtung zum Auskoppeln eines Signals und Verfahren zum Auskoppeln eines Signals
DE102018205202.6 2018-04-06

Publications (1)

Publication Number Publication Date
WO2019192766A1 true WO2019192766A1 (fr) 2019-10-10

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Application Number Title Priority Date Filing Date
PCT/EP2019/053252 WO2019192766A1 (fr) 2018-04-06 2019-02-11 Dispositif et procédé d'extraction d'un signal

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DE (1) DE102018205202A1 (fr)
WO (1) WO2019192766A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021128638A1 (de) 2021-11-03 2023-05-04 optiMEAS Measurement and Automation Systems GmbH Adaptereinheit und Verfahren zum Ankoppeln einer Auswerteeinheit an einen Datenbus sowie System und Fahrzeug mit entsprechender Adaptereinheit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993002518A1 (fr) * 1991-07-15 1993-02-04 Afferent Technologies Incorporated Appareil et procede de controle et de commande
US5249183A (en) * 1991-03-14 1993-09-28 Level One Communications, Inc. Interfacing unit for local area networks
US20040073402A1 (en) * 2002-03-12 2004-04-15 Delacruz Moises A. Data transmission method for a multi-protocol handheld field maintenance tool
DE102005042060A1 (de) 2005-05-24 2006-11-30 Continental Teves Ag & Co. Ohg Rückwirkungsfreie Auskopplung von CAN-Bus-Signalen
US20100082805A1 (en) * 2008-09-29 2010-04-01 Woodhead Industries, Inc. Microcontroller network diagnostic system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5249183A (en) * 1991-03-14 1993-09-28 Level One Communications, Inc. Interfacing unit for local area networks
WO1993002518A1 (fr) * 1991-07-15 1993-02-04 Afferent Technologies Incorporated Appareil et procede de controle et de commande
US20040073402A1 (en) * 2002-03-12 2004-04-15 Delacruz Moises A. Data transmission method for a multi-protocol handheld field maintenance tool
DE102005042060A1 (de) 2005-05-24 2006-11-30 Continental Teves Ag & Co. Ohg Rückwirkungsfreie Auskopplung von CAN-Bus-Signalen
US20100082805A1 (en) * 2008-09-29 2010-04-01 Woodhead Industries, Inc. Microcontroller network diagnostic system

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